Permutation-lock



(ModeL) 2 Sheets-Sheet 1. E. A. LAPP.

PERMUTATION LOOK. No. 415,647. Patented Nov. 19, 1889.

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Jnvenior labhafsmaiw ZL UNITED STATES PATENT OFFICE.

JLDIVARD A. LAPP, OF UPPER ALTON, ILLINOIS.

PERMUTATlON-LOCK.

SPECIFICATION forming part of Letters Patent No. 415,647, dated November 19, 1889.

' Application filed May 15, 1889, Serial No. 310,865. (Model) T0 aZZ whom it may concern.-

Be it known that I, EDWARD A. LAPP, a citizen of the United States, residing at Upper Alton, in the county of Madison and State of Illinois, have invented a new and useful Permutation-Lock, of which the following is a specification.

My invention relates to improvements in permutation-locks; and it consists in certain novel features hereinafter described and claimed. a

Figure 1 is a side View of a lock constructed in accordance with my invention. Fig. 2 is a similar view with the side of the casing re-.

moved. Fig. 3 is a transverse section on the line a; no of Fig. 2. Fig. 4. is a sectional View on the line y y of Fig. 2. Fig. 5 is a view similar to Fig. 2 and showing the bolt Withdrawn. Fig. 6 is adetail perspective view of the tumbler.

The casing A of my improved lock may be of any desired construction, and is provided on one of its inner faces with the recess B, the purpose of which will be hereinafter set forth. The bolt 0 is mounted in the casing in the usual manner and is normally proj ected by a spring D, as shown. The bolt is withdrawn by the crank-arms E on the knobshaft F, as will be readily understood. The bolt is provided in one side with the recess G, to provide room for the play of the tumblers, and it is further provided with the projection or spur H, adapted to engage elongated notches in the edges of the tumblers. The tumblers I are loosely mounted on a shaft J, secured transversely in the casing, and may be of any desired number. The tumblers are provided in their edges with the notches K,

which are adapted to be engaged by the teeth of the operating-Wheel, as will be hereinafter more fully described. The tumblers are further provided in their edges with the elongated notches L, which are adapted to receive the point or spur H of the bolt, and

thereby allow the bolt to bewithdrawn. Upon the shaft J, adjacent to each tumbler, I mount a stop-plate M, which is equal in radius to the greatest radius of the tumbler, and is provided at its end witha lug N, which is adapted to fit in one of the notches K in the or pawl b, pivoted within the casing.

edge of the tumbler. The tumblers are further engaged by the pawls O, which are mounted in guides P P, arranged within the casing, and are normally held in engagement with the tumblers by the springs Q, which are secured at one end to the side of the easing and have their free ends bearing on the pawls.

The operating-shaft R is mounted in the side of the casing and is movable longitudinally in its bearings. The operating-wheel S is secured rigidly on the said shaft, and the said shaft is provided at its ends with operating-knob T, as shown. The shaft is provided with a series of annular grooves U, corresponding in number to the tumblers, and the said grooves are engaged by a slide V, which is mounted on the side of the casing and is normally pressed against the said shaft by a spring secured on the side of the casing and bearing against the end of the slide. The shaft is moved longitudinally in its bearings to bring the operating-wheel in engagement with the. tumbler, and the slide will engage the proper groove in the shaft to indicate which tumbler is engaged by the operatingwheel. WVhen the bolt is projected, the operating-shaft is moved so as to bring the operating-wheel into the recess B, and the latch X, which is pivoted within the casing and projects through the edge of the same, is then turned over the operating-wheel, so as to prevent the same being manipulated from the outside. The bolt is provided on one side with a lug a, which may be engaged by alatch By this arrangement the bolt may be locked from the inside without using the combination.

Such being the construction and arrangement of the several parts of my device, the operation of the same will be readily understood from the foregoing description, taken in connection with the accompanying drawings. The bolt is projected into the keeper so as to lock the doorby the spring D, as before stated, and as will be readily understood, and when so projected it will be prevented from being withdrawn by reason of the tumblers interfering with and arresting the motion of the bolt. WVhen it is desired to withdraw the ceive the same.

- operating-shaft is then moved longitudinally V in its bearings, so as to disengage the operat ing-wheel from the tumblers. When the tumblers are being arranged so as to prevent the withdrawal'of the bolt, they are each 'rorated in the direction indicated by the arrow until the lug N on the stop plate M has; been brought around to the operating-wheeL. when the further rotation of the tumbler and 1 the operating-wheel will be prevented. The combination will be denoted by the number of teeth which will be engaged by the pawls as the tumbler is rotated to bring the'sa'idl lug against the operating-wheel. WVhen it is desired to unloekthe door, the tumblers willv be rotated in the contrary direction, and the distance they are rotated will be denoted by the'clicking sound of the pawls engaging the; notches, thereby indicating the number of teeth which pass the pawl. The combination: may be varied at will by "shifting the stop plates, so as to cause the lugs thereon to engage the tumbler-sat different points. When it is desired to prevent the operation of the look from the outside, the latch is swung over the operating-wheel, as before stated, and asg will be readily understood.

' It will be seen from the foregoing"descrip-Q tion, taken in connection with the accompa-l nying drawings, that I have provided an BX-l tremely simple lock, which can be easily operated and which will effectually accom' the slide adapted to engage one of said grooves, and the operating-wheel secured rigidly on said shaft and adapted to engage said tumblers, as set forth. 7,

2. The combination 'of' the casing having the recess B, the bolt sliding in the casing, the tumblers adapted to engage the bolt, the operating-shaft mounted in the casing and movable longitudinally in its bearings, the operating-wheel secured rigidly on said shaft and adapted to engage the tumblers and to be drawn into the recess .13, the operatingwheel being out of engagement with the tumblers when in said recess, and the latch pivoted within the casing and adapted to be turned over the said recess, as set forth.

3. The-combination of the sliding bolt, the tumblers adapted to engage the bolt, mech- 'anism for operating the tumblers, the guides P P, the pawls mounted in said guides, and the springs bearing on said pawls and pressing them into engagement with the tumblers,

as set forth.

In testimony that'l claim the foregoing as my own I have hereto affixed my signature 'in presence of two witnesses.

EDWARD A. LAPP. tVitnesses:

LEE ELLIS, S. W. WIGHTMAN. 

